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Neutron Structure of the Ground State of 7He

  • Fields, Particles, and Nuclei
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Abstract

A study of the neutron structure of the ground state of 7He has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reactions 9Be(π−, d) X and 11B(π−, dd) X have been investigated where X denotes any system with five neutrons and two protons — the constituencies of a 7He nucleus. The results point out to the existence of a halo-like configuration of the ground state of 7He with all three neutrons outside of the alpha particle core. The structure of this complicated halo-like state is determined by the correlations of neutrons in the p3/2 and p1/2 shells. The result would be in agreement with the previous works pointing out to a considerable mixing of configurations containing neutrons in the p3/2 and p1/2 states.

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Funding

This work was partly supported by the Russian Science Foundation (project no. 18-12-00312) and by the Ministry of Education and Science of the Russian Federation (project no. 3.4911.2017/6.7 and project no. 02.a03.21.0005 of the competitive growth program for the National Research Nuclear University MEPhI, agreement on August 27, 2013).

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Authors and Affiliations

  1. Moscow Engineering Physics Institute, National Research Nuclear University MEPhI, Moscow, 115409, Russia

    B. A. Chernyshev, Yu. B. Gurov & S. V. Lapushkin

  2. National Research Center Kurchatov Institute, Moscow, 123182, Russia

    A. S. Demyanova & A. A. Ogloblin

  3. Faculty of Physics, Moscow State University, Moscow, 119991, Russia

    S. A. Goncharov

  4. Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia

    V. G. Sandukovsky

  5. Department of Physics, University of Jyvaskyla, Jyvaskyla, FIN-40014, Finland

    W. H. Trzaska

Authors
  1. B. A. Chernyshev
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  2. A. S. Demyanova
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  3. S. A. Goncharov
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  4. Yu. B. Gurov
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  5. S. V. Lapushkin
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  6. A. A. Ogloblin
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  7. V. G. Sandukovsky
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  8. W. H. Trzaska
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Correspondence to B. A. Chernyshev.

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Chernyshev, B.A., Demyanova, A.S., Goncharov, S.A. et al. Neutron Structure of the Ground State of 7He. Jetp Lett. 110, 97–101 (2019). https://doi.org/10.1134/S0021364019140030

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  • DOI: https://doi.org/10.1134/S0021364019140030

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